Patent DE-102008050899-A1 (DE)
Title: Device for moistening flexible flat material existing out of paper in the form of web or sheet, with ionized water steam, comprises a steam-blowing unit having two flat steam discharge areas equipped with steam discharge opening
Inventor: BACH GERHARD
IPC: D21H23/74
Filed: 2008-09-25
Abstract: The device comprises either: a steam-blowing unit having two flat steam discharge areas equipped with steam discharge opening for the discharge of water vapor, guidance means for the flat material, adjusting means for variable adjustment of transverse interval between the steam discharge area and the flat material, and means through which the flat material to be moistened is placed at a counter potential to the ionized water steam, and an ionizer for ionizing the water steam, or fluid spraying units having fluid discharge area equipped with fluid discharge opening for discharging of water. The device comprises either: a steam-blowing unit having two flat steam discharge areas equipped with steam discharge opening for the discharge of water vapor, guidance means for the flat material, adjusting means for variable adjustment of transverse interval between the steam discharge area and the flat material, and means through which the flat material to be moistened is placed at a counter potential to the ionized water steam, and an ionizer for ionizing the water steam, or fluid spraying units having fluid discharge area equipped with fluid discharge opening for discharging of water. The flat material to be moistened passes on the steam discharge area. The steam discharge area and fluid discharge area are formed by a gas permeable microporous material layer, whose pores form the steam discharge opening and fluid discharge opening and on which the flat material is passed with a slight distance so that a film-like thin steam-compression pad or film-like thin aerosol-compression pad form itself between the steam discharge area or fluid discharge area and the flat material, which passes with slight interval of 0.2-0.6 mm at the steam discharge area. The steam-blowing unit comprises steam-compression pad as air stripping means for stripping an air boundary layer of the flat material entrained by the self-moving flat material. The steam-discharge areas are arranged transverse to the movement direction of the flat materials and limit itself between passage gaps for the flat materials in such a way that the respective longitudinal section of the flat material present in the passage gap is arranged to opposite sides of the steam-compression pad. The steam discharge areas are formed by separate steam-blowing units, which are arranged to each other in the movement direction of the flat material in an interval. The electric conductive microporous material layer is direct component of the ionizer and is assigned a means for applying an ionization potential. The microporous material layer consists of a metal. The pores of the microporous material layer have an average diameter of 10-30 mu m. The microporous material layer is a component of a steam-blowing wall flow throughable by water steam. The steam-blowing wall is component of a housing of the steam-blowing units limiting a steam distribution area. The microporous material layer is subjected on a carrier wall equipped with an individual steam discharge channels. The flat material is moistened by electrostatically supported application of aerosol produced by spraying on the flat material.